 Public lectures in the courtroom every half-hour 9:30 a.m.-3:30 p.m. when the court is not hearing arguments. Public seating for arguments when the court is in session is on a first-come, first-served basis on the day the court meets. Call ahead to confirm court meeting location.

 The Amazonia Science Gallery depicts a living river system, a rain forest and field-research exhibits. A biological diversity study center has a scanning electron microscope and a collection of live insects and amphibians.

Tudor Place Historic House and Garden

1644 31st St. NW. 202/337-5815.

 House and garden tours available Sunday afternoons and all day Tuesday-Saturday. $3-$6.

 Year-round Sunday hikes using chartered bus with pickup points in the District, Virginia and Maryland. Monthly moonlight hikes on the C&O Canal from early spring to late fall. www.capitalhikingclub.org

Center Hiking Club

 Weekend and Wednesday evening hikes. 703/527-2349.

Freestate Happy Wanderers

 Walks every day on six walking trails through Maryland. 410/437-2164 or 301/490-5850 before 9 p.m. to request a brochure.

 West Potomac Rugby Club, a social and competitive Division III club, is looking for recruits of all ages. For more information on practices and team events, see www.dcrugby.org or call 202/236-3548.

RUNNING

D.C. Road Runners

 Weekly runs throughout the area. 703/241-0395, Ext. 3.

Montgomery County Road Runners

 Weekly training runs and semimonthly races. 301/353-0200.

Road Runners of America

 The club updates its race hot line every week. 703/683-RRCA.

SOFTBALL

Northern Virginia Senior Softball

 Northern Virginia Senior Softball seeks men 50 and older and women 40 and older to play slow-pitch softball on Tuesday and Thursday mornings. Season runs through the fall. Fees are $35 and include team T-shirt and ball cap. Call Dave, 703/524-5576.